Wireless Communication

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Wireless Communication


Communication

n Is the exchange of information

n This exchange achieved through signals

n Verbal and non verbal

Signals

n A signal is a set of information or data
n May be electrical, electromagnetic, acoustic optical and so many others.
n A communication is termed as accordingly
n Communication by electromagnetic signals is termed as radio communication
n Analog signal - signal intensity varies in a smooth fashion over time
• No breaks or discontinuities in the signal
n Digital signal - signal intensity maintains a constant level for some period of time and then changes to another constant level
n Periodic signal - analog or digital signal pattern that repeats over time
• s(t +T ) = s(t )
where T is the period of the signal


n A common signal (Sinusoidal or Sine wave) General Sine wave is represented by
s(t ) = A sin(2pft + F)
F measure of the relative position in time within a single period of a signal
2pft =wt where w is measure of angle in radians

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